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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>实验三-2</title>
    <link rel="stylesheet" href="./三_2.css">
</head>
<body>
    <table>
        <tr>
            <th colspan="3">产品月销量</th>
        </tr>
        <tr>
            <th>ID</th>
            <th>产品名称</th>
            <th>销量</th>
        </tr>
        <tr>
            <td>2021090901</td>
            <td>马克杯</td>
            <td>5000</td>
        </tr>
        <tr>
            <td>2021090901</td>
            <td>啤酒杯</td>
            <td>5200</td>
        </tr>
        <tr>
            <td>2021090901</td>
            <td>搪瓷杯</td>
            <td>3500</td>
        </tr>
        <tr id="a">
            <th colspan="2">合计</th>
            <th>13750</th>
        </tr>
    </table>
</body>
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